fox's jonathan siri has the latest. >> pain, to manage the pain. >> reporter: the centers for disease control and prevention has a bold warning. 13,000 americans might be at some risk in a meningitis outbreak linked to tainted steroid injects for back pain -- injections for back pain. >> the problem is if it is injected with fungus and it is injected into the spinal fluid, that can travel up to the brain. >> the steroid was made i i bia specialty pharmacy in massachusetts which has called the product. -- the steroid was made by a specialty pharmacy in massachusetts which was recalled the product. tennessee health officials rushing to get the word out to patients who may not even know they've been infected. >> in many cases, that meant knocking on doors and asking and answering questions. >> reporter: patients saw this medication as a way to manage their pain without surgery. >> the procedures that they wanted to take, i'm not going to do surgery, you don't tamper with your thais pretty dangerous so i decided to try this route. >> reporter: even though this potentially contaminated inj